A bag has Rs.420 in the denomination of Rs.1, Rs. 2 and Rs. 5 coins. The number Rs.1, Rs.2 and Rs.5 coins are in the ratio of 8: 1:5. How many coins of Rs.5 are in the bag?

Find the value of x:
2³ × 3⁴ × 1080 ÷ 15 = 6^x

The product of two whole numbers is 37. The square root of the difference of the numbers is

If $$ {\sqrt{1+{473\over{256}}}=1+{x\over 16}}$$ then what does x equal to ?

If (a + b):(b + c):(c + a) = 7:6:5 and a + b + c = 27, then what will be the value of 1/a: 1/b :1/c?

12 × 15 + 27 – ? = 28% of 400

$$ { \sqrt{(0.798)^2+0.404×0.798+(0.202)^2}+1=?} $$

In a garden of 42 trees, 3/7 of them are Neem trees and the rest are Mango trees. Find the number of Mango trees.